📖 Fix Comment in wad_exp

[zhouxianyuan]

🕓 Changelog

Revise the comment in wad_exp from < 0.5 to < 1 to ensure consistency with the implementation.

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[pcaversaccio]

Ok, I just verified that exp(-41.446531673892822312) yields:

0.000000000000000001_00000000000000000032384618431855573687226497086675755641671093370608029764125820546168033941594517613715929615438952360683386034935582334897098932984892

and exp(-41.446531673892822313) yields:

0.000000000000000000_99999999999999999932384618431855573704841878654820181953970238833193394298170539313588619717615853339733266852465617238851717356196353027188571558619488

and the old comment was related to the expression exp(-42.139678854452767551) (see here), yielding:

0.000000000000000000_50000000000000003537053915288836740352270343084797256987197084168752771444839883138733470003894871082191707084689128857631928612944262161920887697007978

Thanks for spotting this @zhouxianyuan!